| Company Name [desc] | Country |
|---|---|
| Onkogen Kft. | Hungary |
| Oncurious NV | Belgium |
| Oncostellae S L | Spain |
| Oncoscience GmbH | Germany |
| Oncorena AB | Sweden |
| Oncoral Pharma ApS | Denmark |
| Oncopeptides AB | Sweden |
| Onconova Europe GmbH | Germany |
| Oncoinvent AS | Norway |
| ONCOHEROES BIOSCIENCES S.L. | Spain |
| OncoArendi Therapeutics S.A. | Poland |
| ONCO-EUROPE Kft. | Hungary |
| OmniVision GmbH | Germany |
| OmniSpirant Limited | Ireland |
| OKKLO Life Science BV | Netherlands |
| OHRE Pharma | France |
| ODIMMA SAS | France |
| OCEAN FARMA S.R.L. | Italy |
| OC Vigilance SL | Spain |
| Obvius Investment B.V. | Netherlands |
| ObsEva Ireland Limited | Ireland |
| Oblita Therapeutics bvba | Belgium |
| OBA Pharma ApS | Denmark |
| Oasmia Pharmaceutical AB | Sweden |
| OAK Healthcare GmbH | Germany |
| O.S.K. LEDPHARM LTD | Cyprus |
| NXM PHARMA UNIPESSOAL LDA | Portugal |
| Novisis Pharma Ltd | Cyprus |
| Noventis, s.r.o. | Czech Republic |
| Noventia Pharma Srl | Italy |
| Novan Therapeutics, Limited | Ireland |
| Novalis Investments S.L. | Spain |
| Novadip Biosciences | Belgium |
| Nova Laboratories Ireland Limited | Ireland |
| Northwest Biotherapeutics, BV | Netherlands |
| NorthSea Therapeutics B.V. | Netherlands |
| Norpharm Regulatory Services Ltd | Ireland |
| Norma Hellas s.a. | Greece |
| Nordic Prime ApS | Denmark |
| Nordic Nanovector ASA | Norway |
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